代码如下：
function onInitFs(fs) {
fs.root.getFile('log.txt', {create: true}, function(fileEntry) {
// Create a FileWriter object for our FileEntry (log.txt).
fileEntry.createWriter(function(fileWriter) {
fileWriter.onwriteend = function(e) {
console.log('Write completed.');
};
fileWriter.onerror = function(e) {
console.log('Write failed: ' + e.toString());
};
// Create a new Blob and write it to log.txt.
var blob = new Blob(['Lorem Ipsum'], {type: 'text/plain'});
fileWriter.write(blob);
}, e => alert('4 * 1024' + e));
}, e => alert('4 * 1024' + e));
}
window.webkitRequestFileSystem(window.PERSISTENT, 1024*1024, onInitFs, e => alert('4 * 1024' + e));
http://houzhiqingjava.blog.163.com/blog/static/167399507201431894210152/
https://www.html5rocks.com/en/tutorials/file/filesystem/
window.webkitStorageInfo.queryUsageAndQuota(webkitStorageInfo.PERSISTENT,
function(used, remaining) {
if (remaining == "") {
alert("未申请空间。");
} else {
alert("已使用空间" + used);
alert("全部空间" + remaining);
}
},
e => alert('4 * 1024' + e));